MM2 ATOM TYPE LIST
| ATOM TYPE | SYM | DESCRIPTION | AT WT |
| 1 | C | CSP3 | 12.000 |
| 2 | C | CSP2 ALKENE | 12.000 |
| 3 | C | CSP2 CARBONYL | 12.000 |
| 4 | C | CSP ALKYNE,C=C=O | 12.000 |
| 5 | H | EXCEPT ON N/O | 1.008 |
| 6 | O | C-O-H, C-O-C | 15.995 |
| 7 | O | =O CARBONYL | 15.995 |
| 8 | N | NSP3 | 14.003 |
| 9 | N | NSP2 (AMIDE) | 14.003 |
| 10 | N | NSP | 14.003 |
| 11 | F | FLUORIDE | 18.998 |
| 12 | Cl | CHLORIDE | 34.969 |
| 13 | Br | BROMIDE | 78.918 |
| 14 | I | IODIDE | 126.900 |
| 15 | S | -S- SULFIDE | 31.972 |
| 16 | S+ | >S+ S-FONIUM | 31.972 |
| 17 | S | >S=O S-OXIDE | 31.972 |
| 18 | S | >SO2 SULFONE | 31.972 |
| 19 | Si | SILANE | 27.977 |
| 20 | LP | LONE PAIR | 0.000 |
| 21 | H | -OH ALCOHOL | 1.008 |
| 22 | C | CYCLOPROPANE | 12.000 |
| 23 | H | NH AMINE | 1.008 |
| 24 | H | COOH CARBOXYL | 1.008 |
| 25 | P | >P- PHOSPHINE | 30.994 |
| 26 | B | TRIGONAL | 11.009 |
| 27 | B | TETRAHEDRAL | 11.009 |
| 28 | H | C=COH/AMIDE | 1.008 |
| 29 | C | RADICAL | 12.000 |
| 30 | C+ | CARBONIUM ION | 12.000 |
| 31 | Ge | GERMANIUM | 73.922 |
| 32 | Sn | TIN | 117.902 |
| 33 | Pb | LEAD (IV) | 207.977 |
| 34 | Se | SELENIUM | 79.917 |
| 35 | Te | TELLURIUM | 129.907 |
| 36 | D | DEUTERIUM | 2.014 |
| 37 | N | -N= AZO,PYRIDINE | 14.003 |
| 38 | C | CSP2 CYCPROPENE | 12.000 |
| 39 | N | NSP3 (AMMONIUM) | 14.003 |
| 40 | N | NSP2 (PYRROLE) | 14.003 |
| 41 | O | OSP2 (FURAN) | 15.995 |
| 42 | S | SSP2 (THIOPHENE) | 31.972 |
| 43 | N | -N=N-O AZOXY | 14.003 |
| 45 | N | AZIDE (CENTER-N) | 14.003 |
| 46 | N | NO2 (NITRO) | 14.003 |
| 47 | O | CARBOXYLATE | 15.995 |
| 48 | H | AMMONIUM | 1.008 |
| 49 | O | EPOXY | 15.995 |
| 50 | C | BENZENE | 12.000 |
| 51 | He | HELIUM | 4.003 |
| 52 | Ne | NEON | 20.179 |
| 53 | Ar | ARGON | 39.948 |
| 54 | Kr | KRYPTON | 83.800 |
| 55 | Xe | XENON | 131.300 |
| 59 | Mg | MAGNESIUM | 24.301 |
| 60 | P | P (V) | 30.994 |
| 61 | Fe | IRON (II) | 55.847 |
| 62 | Fe | IRON (III) | 55.847 |
| 63 | Ni | NICKEL (II) | 58.710 |
| 64 | Ni | NICKEL (III) | 58.710 |
| 65 | Co | COBALT (II) | 58.933 |
| 66 | Co | COBALT (III) | 58.933 |
| 69 | O | AMINE OXIDE | 15.995 |
| 70 | O | KETONIUM OXYGEN | 15.995 |
| 71 | C | KETONIUM CARBON | 12.000 |
| 72 | N | =N- IMINE, OXIME | 14.003 |
| 73 | N+ | -N(+)= PYRIDIN. | 14.003 |
| 74 | N+ | -N(+)= IMMINIUM | 14.003 |
| 75 | N | N-OH (OXIME) | 14.003 |